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At 21:28 5/04/00 EDT, you wrote:
>The Proton Mag Forum
>
>Characterization of the 4oxo2,2,6,6tetramethylpiperidinooxy dosimeter for
>in situ radiolysis electron spin resonance studies.
>
>Keith P. Madden
>
>Radiat. Res. 147, 335341 (1997)
>
>NDRL 3935
>The stable free radical 4oxo2,2,6,6tetramethylpiperidinooxy (2,2,6,6tetram
>ethylpiperidoneNoxyl, TEMPONE) in nitrous oxidesaturated aqueous formate
>solution has been shown to be a quantitative dosimeter for in situ radiolysis
>electron spin resonance (ESR) studies. The bleach of the TEMPONE ESR signal
>is proportional to the absorbed dose in steadystate
>radiolysis/field-modulation and in pulse radiolysis/timeresolved studies.
>The G value for consumption of TEMPONE in nitrogendeoxygenated solution is
>5.3 (molecules per 100 eV), while the value in nitrous oxidesaturated
>solution is 6.0. Measurement of the radiolytically produced yield of carbon
>dioxide shows that the product of reaction of carbon dioxide radical anion
>with TEMPONE gives the corresponding hydroxylamine. The stability of the
>integrated intensity of the TEMPONE ESR bleach has been evaluated in the
>presence and absence of oxygen and found to be stable for hours. The ESR
>linewidth of TEMPONE solutions irradiated under anoxic conditions was
>constant in the postirradiation period. However, when oxygen was added
>postirradiation, the oxygenbroadened ESR linewidth decreased slowly toward
>the width observed in anoxic media, indicating consumption of dioxygen by,
>with concomitant production of, diamagnetic species in solution.
>
>Characterization of the 4oxo2,2,6,6tetramethylpiperidinooxy dosimeter for
>in situ radiolysis electron spin resonance studies.
>Keith P. Madden
>Radiat. Res. 147, 335341 (1997)
>NDRL 3935
>The stable free radical 4oxo2,2,6,6tetramethylpiperidinooxy
>(2,2,6,6tetramethylpiperidoneNoxyl, TEMPONE) in nitrous oxidesaturated
>aqueous formate solution has been shown to be a quantitative dosimeter for in
>situ radiolysis electron spin resonance (ESR) studies. The bleach of the
>TEMPONE ESR signal is proportional to the absorbed dose in steadystate
>radiolysis/field-modulation and in pulse radiolysis/timeresolved studies.
>The G value for consumption of TEMPONE in nitrogendeoxygenated solution is
>5.3 (molecules per 100 eV), while the value in nitrous oxidesaturated
>solution is 6.0. Measurement of the radiolytically produced yield of carbon
>dioxide shows that the product of reaction of carbon dioxide radical anion
>with TEMPONE gives the corresponding hydroxylamine. The stability of the
>integrated intensity of the TEMPONE ESR bleach has been evaluated in the
>presence and absence of oxygen and found to be stable for hours. The ESR
>linewidth of TEMPONE solutions irradiated under anoxic conditions was
>constant in the postirradiation period. However, when oxygen was added
>postirradiation, the oxygenbroadened ESR linewidth decreased slowly toward
>the width observed in anoxic media, indicating consumption of dioxygen by,
>with concomitant production of, diamagnetic species in solution.
>
And now we all know!
>The Proton Mag Forum
>
>Characterization of the 4oxo2,2,6,6tetramethylpiperidinooxy dosimeter for
>in situ radiolysis electron spin resonance studies.
>
>Keith P. Madden
>
>Radiat. Res. 147, 335341 (1997)
>
>NDRL 3935
>The stable free radical 4oxo2,2,6,6tetramethylpiperidinooxy (2,2,6,6tetram
>ethylpiperidoneNoxyl, TEMPONE) in nitrous oxidesaturated aqueous formate
>solution has been shown to be a quantitative dosimeter for in situ radiolysis
>electron spin resonance (ESR) studies. The bleach of the TEMPONE ESR signal
>is proportional to the absorbed dose in steadystate
>radiolysis/field-modulation and in pulse radiolysis/timeresolved studies.
>The G value for consumption of TEMPONE in nitrogendeoxygenated solution is
>5.3 (molecules per 100 eV), while the value in nitrous oxidesaturated
>solution is 6.0. Measurement of the radiolytically produced yield of carbon
>dioxide shows that the product of reaction of carbon dioxide radical anion
>with TEMPONE gives the corresponding hydroxylamine. The stability of the
>integrated intensity of the TEMPONE ESR bleach has been evaluated in the
>presence and absence of oxygen and found to be stable for hours. The ESR
>linewidth of TEMPONE solutions irradiated under anoxic conditions was
>constant in the postirradiation period. However, when oxygen was added
>postirradiation, the oxygenbroadened ESR linewidth decreased slowly toward
>the width observed in anoxic media, indicating consumption of dioxygen by,
>with concomitant production of, diamagnetic species in solution.
>
>Characterization of the 4oxo2,2,6,6tetramethylpiperidinooxy dosimeter for
>in situ radiolysis electron spin resonance studies.
>Keith P. Madden
>Radiat. Res. 147, 335341 (1997)
>NDRL 3935
>The stable free radical 4oxo2,2,6,6tetramethylpiperidinooxy
>(2,2,6,6tetramethylpiperidoneNoxyl, TEMPONE) in nitrous oxidesaturated
>aqueous formate solution has been shown to be a quantitative dosimeter for in
>situ radiolysis electron spin resonance (ESR) studies. The bleach of the
>TEMPONE ESR signal is proportional to the absorbed dose in steadystate
>radiolysis/field-modulation and in pulse radiolysis/timeresolved studies.
>The G value for consumption of TEMPONE in nitrogendeoxygenated solution is
>5.3 (molecules per 100 eV), while the value in nitrous oxidesaturated
>solution is 6.0. Measurement of the radiolytically produced yield of carbon
>dioxide shows that the product of reaction of carbon dioxide radical anion
>with TEMPONE gives the corresponding hydroxylamine. The stability of the
>integrated intensity of the TEMPONE ESR bleach has been evaluated in the
>presence and absence of oxygen and found to be stable for hours. The ESR
>linewidth of TEMPONE solutions irradiated under anoxic conditions was
>constant in the postirradiation period. However, when oxygen was added
>postirradiation, the oxygenbroadened ESR linewidth decreased slowly toward
>the width observed in anoxic media, indicating consumption of dioxygen by,
>with concomitant production of, diamagnetic species in solution.
>
And now we all know!